Selway River

About

Selway River, Idaho — 1968 Wild and Scenic, One of Original Eight. Long before surveyors arrived, the Selway watershed was core Nez Perce (Niimiipu) territory, used for fishing, hunting, and gathering camas root. The river's salmon runs were among the most productive in the Columbia Basin, and the Nez Perce name for the river referred to its clear, fast-flowing character. The first documented U.S. exploration came with David Thompson's expedition of 1809–1811, who explored the river and named the Selway-Bitterroot country.

The extractive era followed. Gold mining spread extensively through the Selway basin between 1860 and 1910, while from 1880 to 1920 crews logged the drainage's white pine, cedar, and fir. Regionally, the watershed was worked from the 1830s through the 1920s to supply the timber industry and railroad expansion, with local sawmills, logging drives, and downstream lumber operations as the major operators. The exhaustion of old-growth stands around 1910, the start of state forestry conservation in 1915, and the establishment of state forests in the 1930s brought large-scale logging to a close.

Systematic measurement of the river came with the USGS streamgage near Lowell. Established in 1929, station 13336500 has recorded the Selway's discharge ever since — one of Idaho's longer streamflow records and still the reference gauge boaters watch today. Because the Selway runs free, with no dams or reservoirs along its length, that record captures a near-natural hydrograph. The average flow runs about 3,200 cubic feet per second, and the optimal boating window falls between 2,000 and 6,000 cfs. Later hydrological work shifted from measuring flow to protecting quality: under the Clean Water Act framework, the Idaho Department of Environmental Quality studies the Lower Selway subbasin and develops TMDL analyses for the watershed, even as the Selway remains celebrated as among the cleanest large rivers in the country.

The river's defining moment arrived in 1968, when the Selway was named among the original eight rivers designated under the National Wild and Scenic Rivers Act — 47 miles protected in that founding legislation. The permit system that followed became one of the most restrictive in the country, preserving the river's wilderness character for more than five decades. Access is rationed by lottery, with floaters submitting applications only between December 1 and January 31 each year for a coveted summer launch. In 1980 the surrounding 1.3-million-acre Selway-Bitterroot Wilderness was designated, then the largest wilderness area in the U.S. Between 2010 and 2024, Selway conservation efforts protected 99 percent of the watershed from development, and in April 2022 the Western Rivers Conservancy purchased the 152-acre Selway River Ranch, securing nearly a mile of the river's western bank plus half a mile of Elk City Creek.

Today the Selway endures as a premier steelhead, salmon, and trout fishery and as one of North America's premier wilderness whitewater trips — a remote Class III–IV run that typically unfolds over three to five days far from road or rescue. The upper Paradise-to-Selway Falls section is the permitted wilderness stretch; below Selway Falls, the Class II–III lower river to Lowell is road-accessible. A river left wild, its flows and clarity still close to what the earliest surveyors would have found.